Package: linux-image-3.1.0-rc4-amd64 Version: 3.1.0~rc4-1~experimental.1 Severity: Important
There is a screen corruption regression for intel graphics. It sometimes appears spuriously and has been observed by multiple people. However there are ways way to reproduce it: In the free game simutrans, in fullscreen mode (install it from teh Debian package, start using "simutrans -fullscreen") I see the following problem: The lower about 2 cm of the screen don't update. They are black or carry the image from the game startup screen. They flicker once in a while, but otherwise the image stays the same. This makes the game practically unplayable in fullscreen mode. lspci output: 00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (primary) (rev 0c) 00:02.1 Display controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (secondary) (rev 0c) glxinfo: OpenGL vendor string: Tungsten Graphics, Inc OpenGL renderer string: Mesa DRI Intel(R) 965GM OpenGL version string: 2.1 Mesa 7.11 I have bisected this issue to the following commit: d74362c9e45689d8d7e3d4bcf6681c4358ef4f2e is the first bad commit commit d74362c9e45689d8d7e3d4bcf6681c4358ef4f2e Author: Keith Packard <[email protected]> Date: Thu Jul 28 14:47:14 2011 -0700 drm/i915: Flush other plane register writes Writes to the plane control register are buffered in the chip until a write to the DSPADDR (pre-965) or DSPSURF (post-965) register occurs. This patch adds flushes in: intel_enable_plane gen6_init_clock_gating ivybridge_init_clock_gating Signed-off-by: Keith Packard <[email protected]> :040000 040000 68666ff438ff2b9890a72914905b4aadf53e23ef 101e78df34814a3661c87e9e44d10761d0676d7a M drivers Switching to the console and back or taking a screen shot is a temporary (few seconds) workaround. Using kernel command line i915.i915_enable_fbc=0 is a permanent workaround. There were some messages on the Intel-gfx list about this (titled "Screen corruption regression from 3.0 to 3.1rc4"). Philipp -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected] Archive: http://lists.debian.org/[email protected]
