Comment 64 for bug 342923

Bartek wrote : « in order to follow the howto to enable mtrr one has to install an unsupported, pre-release kernel, that's not an option in any way, or am I missing something? »

I tried this experimental kernel with all the hints from http://ubuntuforums.org/showthread.php?t=1130582, however the 2.6.30 kernel simply won't boot on my system on encrypted LVM...

(I activated tiles)

So I had to revert back to the vanilla kernel, but with the experimental xorg and configuration fixes. On my machine it seemed to solve the Kmail and so on graphics corruption problems I had seen, but on the other hand I get some random "full screen flashes" from time to time, which I didn't have with the original config.

On a performance standpoint, I know glxgears is no reliable indicator, however I had ~575 FPS with the original config, and now see only ~230 FPS with the "fixed" config, so I would suppose that the "fix" divided my display perfs by 2 ??

In xorg.conf, I have:

Section "Device"
        Identifier "Configured Video Device"
        VideoRam 262144
        Option "AccelMethod" "uxa"
        Option "EXAOptimizeMigration" "true"
        Option "MigrationHeuristic" "greedy"
EndSection

(The 2 last entries seemingly ignored if I believe what log says, see below)

In /var/log/Xorg.0.log, I see (some entries I believe that may be of interest):
(==) AIGLX enabled
(==) Matched intel for the autoconfigured driver
(II) Module intel: vendor="X.Org Foundation"
        compiled for 1.6.0, module version = 2.7.99
        Module class: X.Org Video Driver
        ABI class: X.Org Video Driver, version 5.0
(II) intel: Driver for Intel Integrated Graphics Chipsets: i810,
        i810-dc100, i810e, i815, i830M, 845G, 852GM/855GM, 865G, 915G,
        E7221 (i915), 915GM, 945G, 945GM, 945GME, IGD_GM, IGD_G, 965G, G35,
        965Q, 946GZ, 965GM, 965GME/GLE, G33, Q35, Q33,
        Mobile Intel® GM45 Express Chipset,
        Intel Integrated Graphics Device, G45/G43, Q45/Q43, G41
(II) Primary Device is: PCI 00@00:02:0
**) intel(0): Option "AccelMethod" "uxa"
(II) intel(0): Integrated Graphics Chipset: Intel(R) 945GME
(--) intel(0): Chipset: "945GME"
(--) intel(0): Linear framebuffer at 0xD0000000
(--) intel(0): IO registers at addr 0xFBD00000
(WW) intel(0): libpciaccess reported 0 rom size, guessing 64kB
(**) intel(0): Using UXA for acceleration
(II) intel(0): 2 display pipes available.
(II) intel(0): Kernel reported 489216 total, 1 used
(II) intel(0): I830CheckAvailableMemory: 1956860 kB available
drmOpenDevice: node name is /dev/dri/card0
drmOpenByBusid: Searching for BusID pci:0000:00:02.0
drmOpenDevice: node name is /dev/dri/card0
drmOpenDevice: open result is 11, (OK)
drmOpenByBusid: drmOpenMinor returns 11
drmOpenByBusid: drmGetBusid reports pci:0000:00:02.0
(II) intel(0): [DRI2] Setup complete
(**) intel(0): Framebuffer compression enabled
(**) intel(0): Tiling enabled
(**) intel(0): VideoRam: 262144 KB
(II) intel(0): Attempting memory allocation with tiled buffers.
(II) intel(0): Tiled allocation successful.
(II) intel(0): adjusting plane->pipe mappings to allow for framebuffer compression
(II) intel(0): vgaHWGetIOBase: hwp->IOBase is 0x03d0, hwp->PIOOffset is 0x0000
(II) UXA(0): Driver registered support for the following operations:
(II) solid
(II) copy
(II) composite (RENDER acceleration)
(==) intel(0): Backing store disabled
(==) intel(0): Silken mouse enabled
(II) intel(0): Initializing HW Cursor
(WW) intel(0): drmDropMaster failed: Unknown error 4294967295
(II) intel(0): Fixed memory allocation layout:
(II) intel(0): 0x00000000-0x005fffff: compressed frame buffer (6144 kB, 0x000000007f800000 physical
)
(II) intel(0): 0x00600000-0x00600fff: compressed ll buffer (4 kB, 0x000000007fe00000 physical
)
(II) intel(0): 0x00601000-0x0060afff: HW cursors (40 kB, 0x000000007fe01000 physical
)
(II) intel(0): 0x0060b000-0x0060bfff: overlay registers (4 kB, 0x000000007fe0b000 physical
)
(II) intel(0): 0x007bf000: end of stolen memory
(II) intel(0): 0x007bf000-0x0f9f3fff: DRI memory manager (248020 kB)
(II) intel(0): 0x10000000: end of aperture
(II) intel(0): BO memory allocation layout:
(II) intel(0): 0x007bf000: start of memory manager
(II) intel(0): 0x00800000-0x00bfffff: front buffer (4096 kB) X tiled
(II) intel(0): 0x0f9f4000: end of memory manager
(II) intel(0): using SSC reference clock of 100 MHz
(II) intel(0): Selecting standard 18 bit TMDS pixel format.
(II) intel(0): Output configuration:
(II) intel(0): Pipe A is off
(II) intel(0): Display plane B is now disabled and connected to pipe A.
(II) intel(0): Pipe B is on
(II) intel(0): Display plane A is now enabled and connected to pipe B.
(II) intel(0): Output VGA is connected to pipe none
(II) intel(0): Output LVDS is connected to pipe B
(II) intel(0): RandR 1.2 enabled, ignore the following RandR disabled message.
(II) intel(0): DPMS enabled
(==) intel(0): Intel XvMC decoder disabled
(II) intel(0): Set up textured video
(II) intel(0): Set up overlay video
(II) intel(0): direct rendering: DRI2 Enabled
(WW) intel(0): Option "EXAOptimizeMigration" is not used
(WW) intel(0): Option "MigrationHeuristic" is not used