Bug#446372: random garbage lines on screen, especially on web browsing
Sergey Lapin wrote:
> A problem is with Fujitsu-Siemens Lifebook E8110.
> At least in xrandr-based dual-head random horizontal garbage lines
> appear on screen, sometimes making web browsing and other graphical
> tasks impossible to achieve. Most excessive effect is during
> browsing of sites with both graphics and text, but also appears
> during xterm work or just moving windows around. Very annoying.
> Not reproducible with linux-image-2.6.21-2-686
>
If downgrading the kernel makes the problem go away, there are
not many possible reasons:
* Are you using the intelfb kernel module?
* DRI should work the same with both kernel since you have a i945.
> SubSection "Display"
> Depth 24
> Modes "1400x1050"
> Virtual 2680 2048
> EndSubSection
> [...]
> (II) intel(0): Increasing the scanline pitch to allow tiling mode (2688 -> 4096).
> (II) intel(0): Memory allocation layout:
> (II) intel(0): 0x00000000-0x0001ffff: ring buffer (128 kB)
> (II) intel(0): 0x00020000-0x00029fff: HW cursors (40 kB, 0x 1f820000 physical)
> (II) intel(0): 0x0002a000-0x00031fff: logical 3D context (32 kB)
> (II) intel(0): 0x00032000-0x00032fff: overlay registers (4 kB, 0x 1f832000 physical)
> (II) intel(0): 0x00040000-0x02a1ffff: front buffer (42880 kB)
> (II) intel(0): 0x007bf000: end of stolen memory
> (II) intel(0): 0x02a20000-0x09217fff: exa offscreen (106464 kB)
> (II) intel(0): 0x09218000-0x0b217fff: back buffer (32768 kB)
> (II) intel(0): 0x0b218000-0x0d217fff: depth buffer (32768 kB)
> (II) intel(0): 0x0d218000-0x0d417fff: DRI memory manager (2048 kB)
> (II) intel(0): 0x0d418000-0x0f417fff: textures (32768 kB)
> (II) intel(0): 0x10000000: end of aperture
> (II) intel(0): front buffer is not tiled
> (II) intel(0): back buffer is not tiled
> (II) intel(0): depth buffer is not tiled
> (EE) intel(0): Cannot support DRI with frame buffer width > 2048.
>
Can you try without such a big virtual screen? 2048x248 is supposed to
work fine. When you try more, like above, DRI is disabled, and I think
there could be some other problems, for instance
https://bugs.freedesktop.org/show_bug.cgi?id=11453
Brice
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