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Merge pull request #1344 from emersion/no-atomic-gamma

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backend/drm: add WLR_DRM_NO_ATOMIC_GAMMA env variable
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emersion 2018-10-29 22:22:40 +01:00 committed by GitHub
commit 11dc1f65d2
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2 changed files with 8 additions and 4 deletions
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10
backend/drm/atomic.c
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@ -208,10 +208,12 @@ static bool atomic_crtc_set_gamma(struct wlr_drm_backend *drm,
struct wlr_drm_crtc *crtc, size_t size, struct wlr_drm_crtc *crtc, size_t size,
uint16_t *r, uint16_t *g, uint16_t *b) { uint16_t *r, uint16_t *g, uint16_t *b) {
// Fallback to legacy gamma interface when gamma properties are not available // Fallback to legacy gamma interface when gamma properties are not available
// (can happen on older intel gpu's that support gamma but not degamma) // (can happen on older Intel GPUs that support gamma but not degamma).
// TEMP: This is broken on AMDGPU. Always fallback to legacy until they get // TEMP: This is broken on AMDGPU. Provide a fallback to legacy until they
// it fixed. Ref https://bugs.freedesktop.org/show_bug.cgi?id=107459 // get it fixed. Ref https://bugs.freedesktop.org/show_bug.cgi?id=107459
if (crtc->props.gamma_lut == 0 || true) { const char *no_atomic_str = getenv("WLR_DRM_NO_ATOMIC_GAMMA");
bool no_atomic = no_atomic_str != NULL && strcmp(no_atomic_str, "1") == 0;
if (crtc->props.gamma_lut == 0 || no_atomic) {
return legacy_iface.crtc_set_gamma(drm, crtc, size, r, g, b); return legacy_iface.crtc_set_gamma(drm, crtc, size, r, g, b);
} }

2
docs/env_vars.md
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@ -7,6 +7,8 @@ wlroots specific
considered the primary DRM device. considered the primary DRM device.
* *WLR_DRM_NO_ATOMIC*: set to 1 to use legacy DRM interface instead of atomic * *WLR_DRM_NO_ATOMIC*: set to 1 to use legacy DRM interface instead of atomic
mode setting mode setting
* *WLR_DRM_NO_ATOMIC_GAMMA*: set to 1 to use legacy DRM interface for gamma
control instead of the atomic interface
* *WLR_LIBINPUT_NO_DEVICES*: set to 1 to not fail without any input devices * *WLR_LIBINPUT_NO_DEVICES*: set to 1 to not fail without any input devices
* *WLR_BACKENDS*: comma-separated list of backends to use (available backends: * *WLR_BACKENDS*: comma-separated list of backends to use (available backends:
wayland, x11, headless) wayland, x11, headless)