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• Drivers Nvidia Geforce Gtx 1070
• Drivers Nvidia Gtx 650
• Drivers Nvidia

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Normally, no environment variables need to be set. Most of theenvironment variables used by Mesa/Gallium are for debugging purposes,but they can sometimes be useful for debugging end-user issues.

LibGL environment variables¶

LIBGL_DEBUG

If defined debug information will be printed to stderr. If set toverbose additional information will be printed.

LIBGL_DRIVERS_PATH

colon-separated list of paths to search for DRI drivers

LIBGL_ALWAYS_INDIRECT

if set to true, forces an indirect rendering context/connection.

LIBGL_ALWAYS_SOFTWARE

if set to true, always use software rendering

LIBGL_NO_DRAWARRAYS

if set to true, do not use DrawArrays GLX protocol (fordebugging)

LIBGL_SHOW_FPS

print framerate to stdout based on the number of glXSwapBufferscalls per second.

LIBGL_DRI2_DISABLE

disable DRI2 if set to true.

LIBGL_DRI3_DISABLE

disable DRI3 if set to true.

Core Mesa environment variables¶

MESA_NO_ASM

if set, disables all assembly language optimizations

MESA_NO_MMX

if set, disables Intel MMX optimizations

MESA_NO_3DNOW

if set, disables AMD 3DNow! optimizations

MESA_NO_SSE

if set, disables Intel SSE optimizations

MESA_NO_ERROR

if set to 1, error checking is disabled as per KHR_no_error. Thiswill result in undefined behavior for invalid use of the API, butcan reduce CPU use for apps that are known to be error free.

MESA_DEBUG

if set, error messages are printed to stderr. For example, if theapplication generates a GL_INVALID_ENUM error, a correspondingerror message indicating where the error occurred, and possibly why,will be printed to stderr. For release builds, MESA_DEBUGdefaults to off (no debug output). MESA_DEBUG accepts thefollowing comma-separated list of named flags, which adds extrabehavior to just set MESA_DEBUG=1:

silent

turn off debug messages. Only useful for debug builds.

flush

flush after each drawing command

incomplete_tex

extra debug messages when a texture is incomplete

incomplete_fbo

extra debug messages when a FBO is incomplete

context

create a debug context (see GLX_CONTEXT_DEBUG_BIT_ARB) andprint error and performance messages to stderr (orMESA_LOG_FILE).

MESA_LOG_FILE

specifies a file name for logging all errors, warnings, etc., ratherthan stderr

MESA_TEX_PROG

if set, implement conventional texture env modes with fragmentprograms (intended for developers only)

MESA_TNL_PROG

if set, implement conventional vertex transformation operations withvertex programs (intended for developers only). Setting this variableautomatically sets the MESA_TEX_PROG variable as well.

MESA_EXTENSION_OVERRIDE

can be used to enable/disable extensions. A value such asGL_EXT_foo-GL_EXT_bar will enable the GL_EXT_foo extensionand disable the GL_EXT_bar extension.

MESA_EXTENSION_MAX_YEAR

The GL_EXTENSIONS string returned by Mesa is sorted by extensionyear. If this variable is set to year X, only extensions defined onor before year X will be reported. This is to work-around a bug insome games where the extension string is copied into a fixed-sizebuffer without truncating. If the extension string is too long, thebuffer overrun can cause the game to crash. This is a work-around forthat.

MESA_GL_VERSION_OVERRIDE

changes the value returned by glGetString(GL_VERSION) andpossibly the GL API type.

• The format should be MAJOR.MINOR[FC|COMPAT]

• FC is an optional suffix that indicates a forward compatiblecontext. This is only valid for versions >= 3.0.

• COMPAT is an optional suffix that indicates a compatibilitycontext or GL_ARB_compatibility support. This is only validfor versions >= 3.1.

• GL versions <= 3.0 are set to a compatibility (non-Core) profile

• GL versions = 3.1, depending on the driver, it may or may not havethe ARB_compatibility extension enabled.

• GL versions >= 3.2 are set to a Core profile

• Examples:

  2.1

  select a compatibility (non-Core) profile with GL version 2.1.

  3.0

  select a compatibility (non-Core) profile with GL version 3.0.

  3.0FC

  select a Core+Forward Compatible profile with GL version 3.0.

  3.1

  select GL version 3.1 with GL_ARB_compatibility enabled perthe driver default.

  3.1FC

  select GL version 3.1 with forward compatibility andGL_ARB_compatibility disabled.

  3.1COMPAT

  select GL version 3.1 with GL_ARB_compatibility enabled.

  X.Y

  override GL version to X.Y without changing the profile.

  X.YFC

  select a Core+Forward Compatible profile with GL version X.Y.

  X.YCOMPAT

  select a Compatibility profile with GL version X.Y.

• Mesa may not really implement all the features of the givenversion. (for developers only)

MESA_GLES_VERSION_OVERRIDE

changes the value returned by glGetString(GL_VERSION) for OpenGLES.

• The format should be MAJOR.MINOR

• Examples: 2.0, 3.0, 3.1

• Mesa may not really implement all the features of the givenversion. (for developers only)

MESA_GLSL_VERSION_OVERRIDE

changes the value returned byglGetString(GL_SHADING_LANGUAGE_VERSION). Valid values areintegers, such as 130. Mesa will not really implement all thefeatures of the given language version if it’s higher than what’snormally reported. (for developers only)

MESA_GLSL_CACHE_DISABLE

if set to true, disables the GLSL shader cache. If set tofalse, enables the GLSL shader cache when it is disabled bydefault.

MESA_GLSL_CACHE_MAX_SIZE

if set, determines the maximum size of the on-disk cache of compiledGLSL programs. Should be set to a number optionally followed byK, M, or G to specify a size in kilobytes, megabytes, orgigabytes. By default, gigabytes will be assumed. And if unset, amaximum size of 1GB will be used.

Note

A separate cache might be created for each architecture that Mesa isinstalled for on your system. For example under the default settingsyou may end up with a 1GB cache for x86_64 and another 1GB cache fori386.

MESA_GLSL_CACHE_DIR

if set, determines the directory to be used for the on-disk cache ofcompiled GLSL programs. If this variable is not set, then the cachewill be stored in $XDG_CACHE_HOME/mesa_shader_cache (if thatvariable is set), or else within .cache/mesa_shader_cache withinthe user’s home directory.

MESA_GLSL

MESA_NO_MINMAX_CACHE

when set, the minmax index cache is globally disabled.

MESA_SHADER_CAPTURE_PATH

see Capturing Shaders

MESA_SHADER_DUMP_PATH and MESA_SHADER_READ_PATH

see Experimenting with ShaderReplacements

MESA_VK_VERSION_OVERRIDE

changes the Vulkan physical device version as returned inVkPhysicalDeviceProperties::apiVersion.

• The format should be MAJOR.MINOR[.PATCH]

• This will not let you force a version higher than the driver’sinstance version as advertised by vkEnumerateInstanceVersion

• This can be very useful for debugging but some features may not beimplemented correctly. (For developers only)

MESA_LOADER_DRIVER_OVERRIDE

chooses a different driver binary such as etnaviv or zink.

NIR passes environment variables¶

The following are only applicable for drivers that uses NIR, as theymodify the behavior for the common NIR_PASS and NIR_PASS_V macros, thatwrap calls to NIR lowering/optimizations.

NIR_PRINT

If defined, the resulting NIR shader will be printed out at eachsuccessful NIR lowering/optimization call.

NIR_TEST_CLONE

If defined, cloning a NIR shader would be tested at each successfulNIR lowering/optimization call.

NIR_TEST_SERIALIZE

If defined, serialize and deserialize a NIR shader would be tested ateach successful NIR lowering/optimization call.

Mesa Xlib driver environment variables¶

The following are only applicable to the Mesa Xlib software driver. Seethe Xlib software driver page for details.

MESA_RGB_VISUAL

specifies the X visual and depth for RGB mode

MESA_CI_VISUAL

specifies the X visual and depth for CI mode

MESA_BACK_BUFFER

specifies how to implement the back color buffer, either pixmapor ximage

MESA_GAMMA

gamma correction coefficients for red, green, blue channels

MESA_XSYNC

enable synchronous X behavior (for debugging only)

MESA_GLX_FORCE_CI

if set, force GLX to treat 8 BPP visuals as CI visuals

MESA_GLX_FORCE_ALPHA

if set, forces RGB windows to have an alpha channel.

MESA_GLX_DEPTH_BITS

specifies default number of bits for depth buffer.

MESA_GLX_ALPHA_BITS

specifies default number of bits for alpha channel.

i945/i965 driver environment variables (non-Gallium)¶

INTEL_NO_HW

if set to 1, prevents batches from being submitted to the hardware.This is useful for debugging hangs, etc.

INTEL_DEBUG

a comma-separated list of named flags, which do various things:

ann

annotate IR in assembly dumps

aub

dump batches into an AUB trace for use with simulation tools

bat

emit batch information

blit

emit messages about blit operations

blorp

emit messages about the blorp operations (blits & clears)

buf

emit messages about buffer objects

clip

emit messages about the clip unit (for old gens, includes the CLIPprogram)

color

use color in output

cs

dump shader assembly for compute shaders

do32

generate compute shader SIMD32 programs even if workgroup sizedoesn’t exceed the SIMD16 limit

dri

emit messages about the DRI interface

fbo

emit messages about framebuffers

fs

dump shader assembly for fragment shaders

gs

dump shader assembly for geometry shaders

hex

print instruction hex dump with the disassembly

l3

emit messages about the new L3 state during transitions

miptree

emit messages about miptrees

no8

don’t generate SIMD8 fragment shader

no16

suppress generation of 16-wide fragment shaders. useful fordebugging broken shaders

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nocompact

disable instruction compaction

nodualobj

suppress generation of dual-object geometry shader code

nofc

disable fast clears

norbc

disable single sampled render buffer compression

optimizer

dump shader assembly to files at each optimization pass anditeration that make progress

perf

emit messages about performance issues

perfmon

emit messages about AMD_performance_monitor

pix

emit messages about pixel operations

prim

emit messages about drawing primitives

reemit

mark all state dirty on each draw call

sf

emit messages about the strips & fans unit (for old gens, includesthe SF program)

shader_time

record how much GPU time is spent in each shader

spill_fs

force spilling of all registers in the scalar backend (useful todebug spilling code)

spill_vec4

force spilling of all registers in the vec4 backend (useful todebug spilling code)

state

emit messages about state flag tracking

submit

emit batchbuffer usage statistics

sync

after sending each batch, emit a message and wait for that batchto finish rendering

tcs

dump shader assembly for tessellation control shaders

tes

dump shader assembly for tessellation evaluation shaders

tex

emit messages about textures.

urb

emit messages about URB setup

vert

emit messages about vertex assembly

vs

dump shader assembly for vertex shaders

INTEL_SCALAR_VS (or TCS, TES, GS)

force scalar/vec4 mode for a shader stage (Gen8-9 only)

INTEL_PRECISE_TRIG

if set to 1, true or yes, then the driver prefers accuracy overperformance in trig functions.

INTEL_SHADER_ASM_READ_PATH

if set, determines the directory to be used for overriding shaderassembly. The binaries with custom assembly should be placed inthis folder and have a name formatted as sha1_of_assembly.bin.The sha1 of a shader assembly is printed when assembly is dumped viacorresponding INTEL_DEBUG flag (e.g. vs for vertex shader).A binary could be generated from a dumped assembly by i965_asm.For INTEL_SHADER_ASM_READ_PATH to work it is necessary to enabledumping of corresponding shader stages via INTEL_DEBUG.It is advised to use nocompact flag of INTEL_DEBUG whendumping and overriding shader assemblies.The success of assembly override would be signified by “Successfullyoverrode shader with sha1 <sha1>” in stderr replacing the originalassembly.

INTEL_BLACKHOLE_DEFAULT

if set to 1, true or yes, then the OpenGL implementation willdefault GL_BLACKHOLE_RENDER_INTEL to true, thus disabling anyrendering.

Radeon driver environment variables (radeon, r200, and r300g)¶

RADEON_NO_TCL

if set, disable hardware-accelerated Transform/Clip/Lighting.

EGL environment variables¶

Mesa EGL supports different sets of environment variables. See theMesa EGL page for the details.

Gallium environment variables¶

GALLIUM_HUD

draws various information on the screen, like framerate, CPU load,driver statistics, performance counters, etc. SetGALLIUM_HUD=help and run e.g. glxgears for more info.

GALLIUM_HUD_PERIOD

sets the HUD update rate in seconds (float). Use zero to update everyframe. The default period is 1/2 second.

GALLIUM_HUD_VISIBLE

control default visibility, defaults to true.

GALLIUM_HUD_TOGGLE_SIGNAL

toggle visibility via user specified signal. Especially useful totoggle HUD at specific points of application and disable forunencumbered viewing the rest of the time. For example, setGALLIUM_HUD_VISIBLE to false andGALLIUM_HUD_TOGGLE_SIGNAL to 10 (SIGUSR1). Usekill-10<pid> to toggle the HUD as desired.

GALLIUM_HUD_SCALE

Scale HUD by an integer factor, for high DPI displays. Default is 1.

GALLIUM_HUD_DUMP_DIR

specifies a directory for writing the displayed HUD values intofiles.

GALLIUM_DRIVER

useful in combination with LIBGL_ALWAYS_SOFTWARE=true forchoosing one of the software renderers softpipe, llvmpipe orswr.

GALLIUM_LOG_FILE

specifies a file for logging all errors, warnings, etc. rather thanstderr.

GALLIUM_PIPE_SEARCH_DIR

specifies an alternate search directory for pipe-loader which overridesthe compile-time path based on the install location.

GALLIUM_PRINT_OPTIONS

if non-zero, print all the Gallium environment variables which areused, and their current values.

GALLIUM_DUMP_CPU

if non-zero, print information about the CPU on start-up

TGSI_PRINT_SANITY

if set, do extra sanity checking on TGSI shaders and print any errorsto stderr.

DRAW_FSE

???

DRAW_NO_FSE

???

DRAW_USE_LLVM

if set to zero, the draw module will not use LLVM to execute shaders,vertex fetch, etc.

ST_DEBUG

controls debug output from the Mesa/Gallium state tracker. Setting totgsi, for example, will print all the TGSI shaders. Seesrc/mesa/state_tracker/st_debug.c for other options.

Clover environment variables¶

CLOVER_EXTRA_BUILD_OPTIONS

allows specifying additional compiler and linker options. Specifiedoptions are appended after the options set by the OpenCL program inclBuildProgram.

CLOVER_EXTRA_COMPILE_OPTIONS

allows specifying additional compiler options. Specified options areappended after the options set by the OpenCL program inclCompileProgram.

CLOVER_EXTRA_LINK_OPTIONS

allows specifying additional linker options. Specified options areappended after the options set by the OpenCL program inclLinkProgram.

Softpipe driver environment variables¶

SOFTPIPE_DEBUG

a comma-separated list of named flags, which do various things:

vs

Dump vertex shader assembly to stderr

fs

Dump fragment shader assembly to stderr

gs

Dump geometry shader assembly to stderr

cs

Dump compute shader assembly to stderr

no_rast

rasterization is no-op’d. For profiling purposes.

use_llvm

the softpipe driver will try to use LLVM JIT for vertexshading processing.

use_tgsi

if set, the softpipe driver will ask to directly consume TGSI, insteadof NIR.

LLVMpipe driver environment variables¶

LP_NO_RAST

if set LLVMpipe will no-op rasterization

LP_DEBUG

a comma-separated list of debug options is accepted. See the sourcecode for details.

LP_PERF

a comma-separated list of options to selectively no-op various partsof the driver. See the source code for details.

LP_NUM_THREADS

an integer indicating how many threads to use for rendering. Zeroturns off threading completely. The default value is the number ofCPU cores present.

VMware SVGA driver environment variables¶

SVGA_FORCE_SWTNL

force use of software vertex transformation

SVGA_NO_SWTNL

don’t allow software vertex transformation fallbacks (will oftenresult in incorrect rendering).

SVGA_DEBUG

for dumping shaders, constant buffers, etc. See the code for details.

SVGA_EXTRA_LOGGING

if set, enables extra logging to the vmware.log file, such as theOpenGL program’s name and command line arguments.

SVGA_NO_LOGGING

if set, disables logging to the vmware.log file. This is usefulwhen using Valgrind because it otherwise crashes when initializingthe host log feature.

See the driver code for other, lesser-used variables.

WGL environment variables¶

WGL_SWAP_INTERVAL

to set a swap interval, equivalent to callingwglSwapIntervalEXT() in an application. If this environmentvariable is set, application calls to wglSwapIntervalEXT() willhave no effect.

VA-API environment variables¶

VAAPI_MPEG4_ENABLED

enable MPEG4 for VA-API, disabled by default.

VC4 driver environment variables¶

VC4_DEBUG

a comma-separated list of named flags, which do various things:

cl

dump command list during creation

qpu

dump generated QPU instructions

qir

dump QPU IR during program compile

nir

dump NIR during program compile

tgsi

dump TGSI during program compile

Drivers Nvidia Geforce Gtx 1070

shaderdb

dump program compile information for shader-db analysis

perf

print during performance-related events

norast

skip actual hardware execution of commands

always_flush

flush after each draw call

always_sync

wait for finish after each flush

dump

write a GPU command stream trace file (VC4 simulator only)

RADV driver environment variables¶

RADV_DEBUG

Gdi sound cards & media devices driver download for windows 10. a comma-separated list of named flags, which do various things:

llvm

enable LLVM compiler backend

allbos

force all allocated buffers to be referenced in submissions

checkir

validate the LLVM IR before LLVM compiles the shader

errors

display more info about errors

forcecompress

Enables DCC,FMASK,CMASK,HTILE in situations where the driver supports itbut normally does not deem it beneficial.

hang

enable GPU hangs detection and dump a report to$HOME/radv_dumps_<pid>_<time> if a GPU hang is detected

img

Print image info

info

show GPU-related information

invariantgeom

Mark geometry-affecting outputs as invariant. This works around a commonclass of application bugs appearing as flickering.

metashaders

dump internal meta shaders

nobinning

disable primitive binning

nocache

disable shaders cache

nocompute

disable compute queue

nodcc

disable Delta Color Compression (DCC) on images

nodynamicbounds

do not check OOB access for dynamic descriptors

nofastclears

disable fast color/depthstencil clears

nohiz

disable HIZ for depthstencil images

noibs

disable directly recording command buffers in GPU-visible memory

nomemorycache

disable memory shaders cache

nongg

disable NGG for GFX10+

nooutoforder

disable out-of-order rasterization

nothreadllvm

disable LLVM threaded compilation

noumr

disable UMR dumps during GPU hang detection (only with RADV_DEBUG=hang)

preoptir

dump LLVM IR before any optimizations

shaders

dump shaders

shaderstats

dump shader statistics

spirv

dump SPIR-V

startup

display info at startup

syncshaders

synchronize shaders after all draws/dispatches

vmfaults

check for VM memory faults via dmesg

zerovram

initialize all memory allocated in VRAM as zero

RADV_FORCE_FAMILY

create a null device to compile shaders without a AMD GPU (e.g.gfx900)

RADV_PERFTEST

a comma-separated list of named flags, which do various things:

bolist

enable the global BO list

cswave32

enable wave32 for compute shaders (GFX10+)

dccmsaa

enable DCC for MSAA images

dfsm

enable dfsm

gewave32

enable wave32 for vertex/tess/geometry shaders (GFX10+)

localbos

enable local BOs

nosam

disable optimizations that get enabled when all VRAM is CPU visible.

pswave32

enable wave32 for pixel shaders (GFX10+)

tccompatcmask

enable TC-compat cmask for MSAA images

RADV_TEX_ANISO

force anisotropy filter (up to 16)

ACO_DEBUG

a comma-separated list of named flags, which do various things:

validateir

validate the ACO IR at various points of compilation (enabled bydefault for debug/debugoptimized builds)

validatera

validate register assignment of ACO IR and catches many RA bugs

perfwarn

abort on some suboptimal code generation

force-waitcnt

force emitting waitcnt states if there is something to wait for

novn

disable value numbering

noopt

disable various optimizations

noscheduling

disable instructions scheduling

radeonsi driver environment variables¶

AMD_DEBUG

a comma-separated list of named flags, which do various things:

nodcc

Disable DCC.

nodccclear

Disable DCC fast clear.

nodccfb

Disable separate DCC on the main framebuffer

nodccmsaa

Disable DCC for MSAA

nodpbb

Disable DPBB.

nodfsm

Disable DFSM.

notiling

Disable tiling

nofmask

Disable MSAA compression

nohyperz

Disable Hyper-Z

no2d

Disable 2D tiling

info

Print driver information

tex

Print texture info

compute

Print compute info

vm

Print virtual addresses when creating resources

vs

Print vertex shaders

ps

Print pixel shaders

gs

Print geometry shaders

tcs

Print tessellation control shaders

tes

Print tessellation evaluation shaders

cs

Print compute shaders

noir

Don’t print the LLVM IR

nonir

Don’t print NIR when printing shaders

noasm

Don’t print disassembled shaders

preoptir

Print the LLVM IR before initial optimizations

gisel

Enable LLVM global instruction selector.

w32ge

Use Wave32 for vertex, tessellation, and geometry shaders.

w32ps

Use Wave32 for pixel shaders.

w32cs

Use Wave32 for computes shaders.

w64ge

Use Wave64 for vertex, tessellation, and geometry shaders.

w64ps

Drivers Nvidia Gtx 650

Use Wave64 for pixel shaders.

w64cs

Use Wave64 for computes shaders.

checkir

Enable additional sanity checks on shader IR

mono

Use old-style monolithic shaders compiled on demand

nooptvariant

Disable compiling optimized shader variants.

nowc

Disable GTT write combining

check_vm

Check VM faults and dump debug info.

reserve_vmid

Force VMID reservation per context.

nogfx

Disable graphics. Only multimedia compute paths can be used.

nongg

Disable NGG and use the legacy pipeline.

nggc

Always use NGG culling even when it can hurt.

nonggc

Disable NGG culling.

alwayspd

Always enable the primitive discard compute shader.

pd

Enable the primitive discard compute shader for large draw calls.

nopd

Drivers Nvidia

Disable the primitive discard compute shader.

switch_on_eop

Program WD/IA to switch on end-of-packet.

nooutoforder

Disable out-of-order rasterization

dpbb

Enable DPBB.

dfsm

Enable DFSM.

Other Gallium drivers have their own environment variables. These maychange frequently so the source code should be consulted for details.