rhgb not at full screen with intel driver

[Gianluca Cecchi]

One of the reasons why I used the intel is because in FC6 and FC7 the
i810 driver quite often gave me a completely black screen instead of
gdm login (instead the rhgb part was ok).
In FC6 quite never I was able to go in 1280x1024 with this monitor and
I had to use 1024x768.
In FC7 sometimes I get ok and sometimes not. Ctrl+Alt+Backspace being
my friend...
Also, in FC6 915resolution command tried, but it doesn't always worked...

After latest updates (and 3194 kernel) the situation is now:
- intel driver
reboot; rhgb screen smaller than full screen, gdm login smaller than full screen
Ctrl+Alt+Backspace gdm login restarts ok in full screen

- i810 driver
reboot; rhgb screen ok; gdm login completely black;
Ctrl+Alt+Backspace gdm login restarts ok

My grpahic controller is reported by lspci as:
00:02.0 VGA compatible controller: Intel Corporation 82915G/GV/910GL
Integrated Graphics Controller (rev 04)
I noticed that  with the i810 I get many WW in Xorg.0.log, while with
intel only ...

warnings:
i810:
(WW) I810(0): Bad V_BIOS checksum (3 times)
(WW) I810(0): Extended BIOS function 0x5f64 not supported. (8 times)
(WW) I810(0): Unable to estimate virtual size
(WW) I810(0): Extended BIOS function 0x5f05 not supported.
(WW) I810(0): Extended BIOS function 0x5f28 not supported. (2 times)

intel:
(WW) intel(0): xf86AllocateGARTMemory: allocation of 10 pages failed
       (Cannot allocate memory)
(WW) intel(0): DRM version 1.9 or newer required for Page flipping. Disabling.

Errors
i810:
None

intel:
(EE) intel(0): Unable to write to SDVOCTRL_E for SDVOB Slave 0x70. (3x5 times)
(EE) intel(0): First SDVO output reported failure to sync (2 times)