[Bug 869017] Re: Ubuntu server enables screenblanking, concealing crashdumps (DPMS is not used)
Some additional information and observations. What I am currently seeing with this issue on 3 systems running Ubuntu 18.04 that did not occur on the same systems that previously ran 16.04 is that the actual screen blanking in 18.04, aside from default settings or overrides, fails to turn off the monitor using DPMS as it did in 16.04, but only with nvidia binary drivers installed and only in 18.04, and only with the console blanking code in its current state. In 18.04 without the nvidia binary driver, console blanking seems to work, as expected, with the consoleblank=n. This includes a correct power down. In 18.04 with the nvidia binary driver 340.107, console blanking only blanks the screen, but fails to power down the monitor- yet a call to vbetool dpms off does work, as do any similar calls in X for those systems that have X installed. So if vbetool dpms works with the nvidia binary driver and the console blanking code no longer does, I am half way to an assumption that the dpms code in the console blanking has changed, with some reservation that possibly the latest nvidia binary driver doesn't like the way the call is coming from the newly changed console blanking code. This problem did not exist in 16.04, on any of our systems to my knowledge, with or without a graphical desktop installed and with or without a binary driver installed. >From my perspective, this isn't an issue of default blanking behaviour, but rather an issue with a broken dpms call in 18.04 to a system with the nvidia binary driver. Other calls, such as vbetool dpms off work as do those within graphical desktop systems such as those like the one that xscreensaver uses. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/869017 Title: Ubuntu server enables screenblanking, concealing crashdumps (DPMS is not used) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/kbd/+bug/869017/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 869017] Re: Ubuntu server enables screenblanking, concealing crashdumps (DPMS is not used)
To Robie Basak, specifically #22, You said, "I don't see how we created another problem. We changed the default, that's all." You seem to have concluded that merely a change of default functionally was made at some point. Perhaps that is the case. If so, what specifically was the default setting that was changed? For example, was it a kernel compilation time option? If so, can you please specify what setting can be changed back in order to re-enable Console blanking using DPMS (console display in power saving mode) for Ubuntu server 18.04? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/869017 Title: Ubuntu server enables screenblanking, concealing crashdumps (DPMS is not used) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/kbd/+bug/869017/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1767568] Re: Console DPMS is not enabled by default in Ubuntu Server 18.04
To Robie Basak, specifically with regards to #37. The title of this bug already specified particularly that Console DPMS is not working. This bug report already was not about simply console blanking. I understand that the original reporter said that he got it working with setterm, but as by convention these bug reports often require verification from others in order to get any attention, it seems only reasonable that after many have said that the DPMS power saving is what is not working, while simple blanking and leaving the monitor on is what is currently happening, that this bug should not have been marked invalid. As many others have pointed out, Console DPMS power saving is not working in 18.04. It is clear after reading this thread as well as a few basic tests with setterm that nobody has working Console DPMS power saving at all in Ubuntu 18.04. If this is only a matter of default settings as you seem to have concluded that it is, then please specify which optional setting re- enables Console DPMS power saving, because the following does NOT work on any of my Ubuntu 18.04 installations (as well as several others in this bug report) beyond mere blanking and leaving the monitor on: in grub.cfg consoleblank=600 setterm --powersave powerdown setterm --powerdown 10 If this is just a kernel option that is no longer the default setting, then it should be specified here, in this bug report, what the appropriate change is to revert back to a very mature working functionality. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1767568 Title: Console DPMS is not enabled by default in Ubuntu Server 18.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1767568/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 684280] Re: casper toram forgets to disconnect loop device
Regarding comment #20, 2019-10-03,
I tried this patch and umount -d ${copyfrom} seems like it should
unmount the loopback device, but it does not.
Yet this works:
root@xubuntu:~# losetup -d /dev/loop0
root@xubuntu:~# umount /isodevice
I am still looking that this, but was curious if anybody else is
experiencing the same issue when booting a recent live iso from disk.
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https://bugs.launchpad.net/bugs/684280
Title:
casper toram forgets to disconnect loop device
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