linux-kernel - regression: GM45 on Dell Latitude E6400 display from 1440x900 to 1024x768 somewhere between 2.6.38-git2 and -git7

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Date:	Thu, 24 Mar 2011 12:30:49 +0100
From:	Alessandro Suardi <alessandro.suardi@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: regression: GM45 on Dell Latitude E6400 display from 1440x900 to
 1024x768 somewhere between 2.6.38-git2 and -git7

Fedora 14 x86_64

[   375.231] (II) intel(0): Integrated Graphics Chipset: Intel(R) GM45
[   375.231] (--) intel(0): Chipset: "GM45"

startx yields:

 2.6.38-git2 and earlier: correct 1440x900 display
 2.6.38-git3 through -git6: not tested due to kernel build errors
 2.6.38-git7 through -git14: wrong 1024x768 display with black bands at sides

Once in wrong mode, xrandr --fb 1440x900 --output LVDS1 --mode 1440x900
 helps return the screen to correct display, but:

 - background image is drawn incorrectly (like a 1440x900 correct one with a
    superimposed 1024x768 starting from upper left corner)
 - mplayer in full screen mode does not actually go full screen, but 1024x768

comparative Xorg logs and dmesg output for 2.6.38-git2 and -git14 available
 upon request; lspci -v says:

00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series
Chipset Integrated Graphics Controller (rev 07) (prog-if 00 [VGA
controller])
	Subsystem: Dell Device 0233
	Flags: bus master, fast devsel, latency 0, IRQ 46
	Memory at f6c00000 (64-bit, non-prefetchable) [size=4M]
	Memory at e0000000 (64-bit, prefetchable) [size=256M]
	I/O ports at ef98 [size=8]
	Expansion ROM at <unassigned> [disabled]
	Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
	Capabilities: [d0] Power Management version 3
	Kernel driver in use: i915
	Kernel modules: i915

00:02.1 Display controller: Intel Corporation Mobile 4 Series Chipset
Integrated Graphics Controller (rev 07)
	Subsystem: Dell Device 0233
	Flags: bus master, fast devsel, latency 0
	Memory at f6b00000 (64-bit, non-prefetchable) [size=1M]
	Capabilities: [d0] Power Management version 3



thanks,

--alessandro

 "There's always a siren singing you to shipwreck"

   (Radiohead, "There There")
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