I have a very similar setup, and had the same issue. Samsung NP535U3C-B01US AMD A6-4455M APU with Radeon(tm) HD 7500G Graphics 3.5.0-17-generic Ubuntu 12.10
Suspend ok, resume with blank screen, no backlight, but system was fully function *Not an expert; actually, I have no idea what I'm doing* 1. Installed FGLRX drivers from "additional drivers", did not work, black screen on reboot 2. Updated kernel to 3.5.0-23 and then 3.8 mainline, did not work. Ended up causing some boot issues. Unistalled everything but 3.5.0-17 3. Installed driver directly from AMD. New version released 1/17/2013 http://support.amd.com/us/gpudownload/linux/Pages/radeon_linux.aspx Did not work, had an install issue, ended up my header was not installed. No idea what that means. 4. Installed header. Maybe I messed something up with the kernel updates. Sucess sudo apt-get install linux-headers-$(uname -r) 5. Installed driver directly from AMD. Success Suspend and Resume now work correctly, and the screen comes back on as it should. However, brightness function keys no longer work. My root cause was a driver issue. I was able to run "dmesg" and "/sys/power/pm_trace" before the fix, so if you are interested in seeing that, please let me know. Similar setup to Mr. Kukol -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1093644 Title: [Samsung NP535U3C-A03DE] Blank screen on resume from suspend To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1093644/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
