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. ** Tags added: kernel-fixed-upstream ** Changed in: linux (Ubuntu) Status: Incomplete => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1168967 Title: regression: no video after upgrading kernel, mesa, libc, and several other packages (ThinkPad T500) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1168967/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
