I also experience this bug on Intrepid (but it already occurred with
Hardy also) with Lenovo X60 Tablet, which has the following chipset:
00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile 945GM/GMS,
943/940GML Express Integrated Graphics Controller [8086:27a2] (rev 03)
Subsystem: Lenovo Device [17aa:201a]
The way how I can always reproduce the blank screen:
1. Login with user A
2. Switch to user B
3. Try to switch back to user A
4. Blank screen with mouse pointer awaits
I tried to add second display on VGA connector which caused everything
to work properly, no blank screen anymore.
On xorg logs I don't get "overrun on pipe" messages when the blank
screen problem occurs. I can always ctrl-alt-backspace out from blank
screen and relogin to get view back. With Hardy I didn't experience this
problem when using i810 driver, but it occurred with intel driver
already back then.
** Attachment added: "xorg log of the blank screen bug"
http://launchpadlibrarian.net/18744074/Xorg.0.log.LVDS
--
[gutsy, hardy, intrepid] Blank screen and (EE) intel(0): overrun on pipe B! on
i945GM using intel driver
https://bugs.launchpad.net/bugs/221119
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