Latest working kernel version: 2.6.29-rc3 Distribution: debian unstable Hardware Environment: IBM X40 Latop Problem Description: In short: When using kms, glxgears is strangely tiled. When _not_ using kms, all the output (save the X cursor) of the 2d ddx is strangely tiled (if the ddx is new enough to support tiling). For the details, see my original bug report on the 2d intel ddx at https://bugs.freedesktop.org/show_bug.cgi?id=20289 After some testing it looks like the kernel is the culprit. For tracking down the exact commit with bisecting my userspace env was: xf86-video-intel: xf86-video-intel-2.4.97.0-369-gd9dbdb3 (using git describe) xorg: 1.6 rc from debian experimental libdrm: libdrm-2.4.5-41-g82eac80 According to my bisect-run, the breakage was introduced in the following commit: commit 0f973f27888e4664b253ab2cf69c67c2eb80ab1b Author: Jesse Barnes <jbarnes@virtuousgeek.org> Date: Mon Jan 26 17:10:45 2009 -0800 drm/i915: add fence register management to execbuf I've tried to revert this on top of 2.6.29-rc8, but this failed due to merge conflicts.
Hi Jesse, I started at the patch for a while, reverted various chunks and finally found the problem. When I reverted the following lines (on top of recent -linus), everything (glxgears in kms and non-kms ddx) works again: --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -186,12 +186,12 @@ #define FENCE_REG_830_0 0x2000 #define I830_FENCE_START_MASK 0x07f80000 #define I830_FENCE_TILING_Y_SHIFT 12 -#define I830_FENCE_SIZE_BITS(size) ((get_order(size >> 19) - 1) << 8) +#define I830_FENCE_SIZE_BITS(size) ((ffs((size) >> 19) - 1) << 8) #define I830_FENCE_PITCH_SHIFT 4 #define I830_FENCE_REG_VALID (1<<0) #define I915_FENCE_START_MASK 0x0ff00000 -#define I915_FENCE_SIZE_BITS(size) ((get_order(size >> 20) - 1) << 8) +#define I915_FENCE_SIZE_BITS(size) ((ffs((size) >> 20) - 1) << 8) #define FENCE_REG_965_0 0x03000 #define I965_FENCE_PITCH_SHIFT 2 I'm using this now with kms to write this comment, so it seems to not have any bad effects. Does that help in tracking down the root cause of these tiling problems? -Daniel
Can you please close this out? I try to keep even drm/i915 bugs at freedesktop.org just to save me some web surfing.