xmobar cannot get battery information

RabbidRabbit · 10-24-2011, 01:29 PM

I have recently been trying out xmonad and xmobar and it has been working well so far.
However, when I try to add the battery information to xmobar I get this error:

Code:

xmobar: /sys/class/power_supply/BAT0/current_now: hGetBufSome: unsupported operation (No such device)

Here is my .xmobarrc config:

Code:

Config { font = "-*-Fixed-Bold-R-Normal-*-13-*-*-*-*-*-*-*"
       , bgColor = "black"
       , fgColor = "grey"
       , position = TopW L 90
       , lowerOnStart = True
       , commands = [ Run Weather "EGPF" ["-t"," <tempF>F","-L","64","-H","77","--normal","green","--high","red","--low","lightblue"] 36000
                    , Run Cpu ["-L","3","-H","50","--normal","green","--high","red"] 10
		    , Run Battery ["Bat0"] 600
                    , Run Memory ["-t","Mem: <usedratio>%"] 10
                    , Run Swap [] 10
                    , Run Date "%a %b %_d %l:%M" "date" 10
                    , Run StdinReader
                    ]
       , sepChar = "%"
       , alignSep = "}{"
       , template = "%StdinReader% }{ %cpu% | %memory% * %swap%  %battery% <fc=#ee9a00>%date%</fc> | %EGPF%"
       }

Ian John Locke II · 10-25-2011, 02:31 PM

Could just be that xmobar has stupidly hard-coded the path to the battery. At least on Slackware that would be the incorrect path. For my small script relating to my battery level, the absolute path is /proc/acpi/battery/.

To be safe though you could do the following

Code:

find /sys -name 'BAT*' 2>&1 | grep -v 'Permission denied'
find /proc -name 'BAT*' 2>&1 | grep -v 'Permission denied'

That should tell you where it should be. You can then patch in the correct path.

RabbidRabbit · 10-25-2011, 04:21 PM

Unfortunately the path is correct. After looking around on the internet it seems that it is a problem with the bios on my hp laptop. What I need is for Xmobar to launch without the current_now seeing as that only gives information to work out how much longer the battery will last for. I only want a percentage of the capacity left.

RabbidRabbit · 10-25-2011, 05:09 PM

I modified the Batt.hs file to ignore the current_now file and now it works as I wanted.

Ian John Locke II · 11-01-2011, 08:36 AM

Sorry I couldn't help more.

xorlop · 05-14-2021, 03:32 AM

I found that by using "BatteryP", you can specify a location to look if your battery has a strange name that is not "BAT0".. my battery is named "CMB0" and was able to get it to work by doing this:

Code:

Run BatteryP ["/sys/class/power_supply/CMB0"] [ "--template", "<acstatus> <left>"
                                  , "--Low", "10"
                                  , "--High", "80"
                                  , "--low", "darkred"
                                  , "--normal", "darkorange"
                                  , "--high", "darkgreen"
                                  , "--"
                                  , "-O", "<left>% <fc=darkgreen>↻</fc>"
                                  , "-i", "<fc=darkgreen>∞</fc>"
                                  , "-o", "<left>% (<timeleft>)"
                                  ] 1000