On mar, fév 19, 2008 at 08:17:33 -0500, Dave Mielke wrote : > [quoted lines by Nath on 2008/02/20 at 00:19 +0100] > > >I have installed debian testing on my new Asus Eee pc and I encounter a > >problem I never have had before : the braille display turns on sleep > >mode every 4 or 5 seconds. when I press a key on the braille display or > >on the laptop keyboard the braille display is up again but if I don't > >press anything, 4 or 5 seconds after it is in sleep mode again. > > You may be a victim of the automatic USB device suspension feature. Brltty > currently disables this feature for Baum displays, but not for others. > Perhaps > it should arbitrarily disable it for all displays. Let's figure out if this > is > your problem: > > Go (cd) to /sys/class/usb_device. In that directory you'll find a bunch of > devices with names like usbdev1.2. The first digit is the bus number and the > second digit is the device number. > > The next thing to do is to figure out which of those usbdevx.y devices > corresponds to your display. Each of them is a directory whcih contains, > among > other things, a subdirectory named device. Each of those device > subdirectories > contains, among other things, a file named manufacturer. So, for example, to > check usbdev1.2, see what usbdev1.2/device/manufacturer says. Find the one > which names the manufacturer of your display. > > When you find the usbdevx.y device which corresponds to your display, cd to > usbdevx.y/device/power. In there you'll find a file called autosuspend. Write > -1 to it, like this (assuming usbdev1.2): > > cd usbdev1.2/device/power > echo >autosuspend -1 > > Please let us know if this resolves your problem. If so, brltty will be > updated > to handle this problem automatically. > > One important thing to note is that the usbdevx.y name will change each time > you disconnect and reconnect your display so don't do that after you've > written > to its autosuspend file else you'll have to do it again. > > -- > Dave Mielke | 2213 Fox Crescent | I believe that the Bible is the > Phone: 1-613-726-0014 | Ottawa, Ontario | Word of God. Please contact me > EMail: [EMAIL PROTECTED] | Canada K2A 1H7 | if you're concerned about Hell. > http://FamilyRadio.com/ | http://Mielke.cc/bible/ > _______________________________________________ > This message was sent via the BRLTTY mailing list. > To post a message, send an e-mail to: BRLTTY@mielke.cc > For general information, go to: http://mielke.cc/mailman/listinfo/brltty > Hi Dave & all,
I think you're right, the problem should be usb autosuspend but unfortunatly writing -1 to /sys/class/usb_device/usbdevx.y/device/power/autosuspend doesn't solve it. Before I wrote -1 in the file the value was 2. There is 2 others files in the power directory, level and wakeup. Wakeup contains the value "enabled" and level contains the value "auto". Instead of -1 I tried with 0 but the problem persists. So perhaps I must modify another thing ? I'm going to search on the web if others solutions exist to disable autosuspend mode. I hope not to have to recompile the kernel. If you have others suggestions to try to disable this, please let me know ! Thx, -- Nath _______________________________________________ This message was sent via the BRLTTY mailing list. To post a message, send an e-mail to: BRLTTY@mielke.cc For general information, go to: http://mielke.cc/mailman/listinfo/brltty
