Bojan, as per http://h20000.www2.hp.com/bizsupport/TechSupport/SoftwareIndex.jsp?lang=en&cc=us&prodNameId=4145326&prodTypeId=321957&prodSeriesId=4145198&swLang=13&taskId=135&swEnvOID=4059#120 an update is available for your BIOS (F.21). If you update to this, does it change anything?
If not, could you please both specify what happened, and provide the output of the following terminal command: sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date Thank you for your understanding. ** Tags added: bios-outdated-f.21 needs-upstream-testing regression- potential ** Changed in: linux (Ubuntu) Status: Confirmed => Incomplete ** Summary changed: - No Sound, mute on HP ProBook 4520s + [HP ProBook 4520s] No Sound, mute on -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1072039 Title: [HP ProBook 4520s] No Sound, mute on To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1072039/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs