Comment 6 for bug 1063656

Hi,

First of all, note that I used XFX Radeon HD 5450 512 MB PCIe graphics card for the analysis, and not the original ATI Technologies Radeon X600 PCIe graphics card for no particular reason.
I will redo the testing with ATI Technologies Radeon X600 PCI graphics card later.
Here is what I found so far.

1) Everything works fine on Ubuntu 10.04 LTS 32-bit (more precisely Ubuntu 10.04.4 LTS 32-bit with all the updates via Update Manager), including ACPI S3 State resume.

2) Something broke in Ubuntu 12.04 LTS 32-bit, and hangs up after displaying Ubuntu desktop's reddish wallpaper (i.e., Mouse is alive, keyboard is alive, but goes nowhere from there.).

3) On Ubuntu 12.04 LTS 32-bit, if I booted it in recovery mode via Grub, and then select 'resume' when prompted, everything will work fine like it did in Ubuntu 10.04 LTS 32-bit.

4) I installed Linux kernel 3.7-rc7 (v3.7-rc7-raring), but it has the same bug as in Linux kernel 3.2.0-34.

5) I was able to install Ubuntu 12.04 with the above configuration, but cannot run Ubuntu from a hard drive or DVD non-installation boot (i.e., Run Ubuntu without installing option). Weird bug.

6) I suspect this is a bug related to Ubuntu desktop or Unity, not x.org ATI Technologies/AMD display device driver because the recovery mode workaround works fine.

7) Again, everything works fine as long as recover mode method already discussed is used, including ACPI S3 State resume I make a lot of noise about all the time.

8) This bug probably didn't get caught during beta testing of Ubuntu 12.04 because very few people own VIA Technologies chipset-based mainboard with PCI Express. I doubt this is a bug of their chipset as everybody likes to blame them all the time as a buggy chipset vendor.

So for those that need a workaround, use recovery mode and select 'resume.'
That's the only workaround I know right now.
Someone, please fix this weird bug specific to Ubuntu 12.04.

Regards,

fpgahardwareengineer