Comment 6 for bug 1168967

Update from testing mainline kernels...

1) to confirm that the bug is still present in the mainline kernel corresponding to Ubuntu's 3.5.0-27.46 (which definitely exhibits the bug), I downloaded and installed linux-image-3.5.7-03050707-generic_3.5.7-03050707.201303040535_amd64.deb (and the corresponding linux-image-extra package)

-> result: bug still present: kernel starts booting in 80x25 text mode, then screen goes black when it tries to switch to high-res mode (same behaviour I get from the Ubuntu kernel)

2) as requested, I downloaded 3.9.0-rc7 from http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.9-rc7-raring/linux-image-3.9.0-030900rc7-generic_3.9.0-030900rc7.201304171402_amd64.deb (N.B. there is no linux-image-extra package in that dir)

-> result: bug seems fixed: kernel starts in 80x25 text, and successfully switches to high-res mode, then changes font, boot process completes with a lightdm login screen

For extra credit, I decided to try to narrow down the search window of which mainline kernel fixed the upstream bug.

3) tried the latest 3.6.x kernel built for quantal: linux-image-3.6.3-030603-generic_3.6.3-030603.201210211349_amd64.deb

-> result: bug seems fixed: behaviour the same as case 2 above

4) tried the latest 3.5.x kernel built for quantal: linux-image-3.5.7-03050710-generic_3.5.7-03050710.201304100835_amd64.deb

-> result: bug still present: behaviour the same as case 1 above

Conclusion: sure looks like it's an upstream kernel bug which was fixed somewhere between 3.5.7.10 and 3.6.3. Will update tags accordingly.